Device for use in shifting tramway points



W. F. M KAY DEVICE FOR USE IN SHIFTING TRAMWAY POINTS Filed Aug. 22, 1924 MM JMMJLK Patented Dec. 2, 18 24 tee;

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'WILLIAM FLEMING MOKAY, OF ABERDEEN, SCOTLAND.

DEVICE FOR USE IN SHIFTING- TRAMVIAY POINTS.

Application filed au ust 22, late. Serial at. 723,502.

To all whom it may cancer Be it known that L WILLIAM FLEMING Melanin a snlnect of the King of Great Britain and Northern Ireland and residing at 106 George Street Aberdeen Scotland, have invented a certain new and useful Improve ment in Devices for Use in Eihifting Tramway Points, of which the following is a specification.

' This invention relates to devices for operating tramway points of the type including operating means on the car and operated means on the track, the operating means being duplicated and provided at each end of the car.

A device according to the invention comprises a point box associated with a point and fitted with a lever fulcrumed between its ends and operatively connected to the point. The lever is formed at one end as a lever-cam for engagement by the tramvay wheel flange and is formed at the other end as a tappet for engagement by a cam formed on a tumbler pivotally mounted on the point box and arranged in the path of a striker so titted on. the tramway car as to be under the control of the driver. When the lever-cam is engaged by the tramway wheel flange, the lever is rocked on its fulcrum and the point is moved to one side, and when the tumbler is engaged by the striker, the lever is again rocked whereby the point moved to the other side.

In the drawing Fig. 1 is a plan ofthe de vice; Fig. 2 is a section on the line 22 of Fig. 1 showing the striker in inoperative position' Fig. 3 is a detail view of the striker and tumbler mechanism showing the striker about to engage the tumbler; Fig. 4 a detail view of the striker and tumbler mechanism showing the striker restored by the tumbler to inoperative position; Figs. 5, 6 and 7 are respectively sections on the lines 55, 66, and 77 of Fig. 1; Fig. 8 is a perspective view of the tumbler.

The device shown comprises a point box 1 associated with which is a point 2 and in which is fitted a lever 3. The lever 3 is fulcrumed at 4 between its ends and is operatively connected to the point by a fork 5 engaging the point 2. One end of the lever is fitted with a plate 6 formed as a cam for engagement by the tramway wheel flange 7 and the other end of the lever is formed at 8 as a tappet for engagement by a cam 9 formed on a tumbler 10 which is pivotally mounted in the tramway rail at 11 and located in the box 1 in the path of a striker 13 so fitted on the tramway car 12 as to be under the control of the driver. When the lever-cam 6 is engaged by the flange 7 the lever 3 is rocked on its fulcrum 4 and the point 2 is moved to one side. When the tumbler 10 is engaged by the striker the lever 3 is again rocked whereby the point 2 is moved to the other side.

The striker and tumbler mechanism is constituted by a hook-like striker 13 pivotally mounted at 13' on the tramway car frame and normally sustained in elevated position by a loaded latch 1a engaging a lug 14 on the striker 13, the latch being connected by a rod 15 to a bell-crank lever 15 which. is connected to a pedal 16 under the control of the driven The latch when withdrawn permits the striker to occupy the operative position in which the tumbler is engaged. The tumbler is provided with an arm 17 formed with a notch 18 for engagement with the striker 13 and is associated with a weight 19 for restoring the tumbler to inoperative position. When the striker 13 is unlatched, the point thereof engages the notch 18 and, in the angular movement of the tumbler about its pivot from the Fig. 3 position to the Fig. 4: position, the striker is displaced vertically into the elevated or inoperative position in which it is re-engaged by the. latch.

To prevent damage to the mechanism due to the lodgment of stones between the point 2 and the tramway rails the fork 5 is yieldingly connected to the point. The tines of the fork are located one on each side of the point and between each tine and the point is interposed a spring; 20, the arrangement be ing such that the fork may move in opposition to the springs 20 through its entire range notwithstanding that the point may be jammed.

What I claim is 1. For cooperation with a tramway car having; flanged wheels, a downwardly extending; striker mounted on said car, and means under control of the car driver for renderin said striker operative, in combinationv a tramway rail a tramway point box adjacent to said rail, a tramway point, a point-operating lever operatively connected to said point and fulcrumed between its ends in said box, the end remote from said point formed as a lever-cam engageable by a 7 wheel able withsaid tappet, the arrangement being such that. when the lever-cam is engaged by the wheel flange, the lever and therewith the point are rocked into one position, and, when the striker engages the tumbler, the lever and therewith the point are rocked, into another position.

'2. i or cooperation with a tramway car having flanged wheels, a downwardly extending striker mounted on said car, and means under control of the car driver for rendering said striker operative, in combination, a tramway rail, a tramway point box adjacent to said rail, a tramway point, a point-operating lever yieldingly connected to said point and fulcrumed between its ends in said box, the end remote from said point formed as a lever-cam engageable by a wheel flange and the endadjacent to said pointformed as a tappet, and a tumbler pivotally mounted on said rail and located in said box in the path followed by said striker when operative so that the tumbler is engaged by said striker and caused to perform a partial rotation about its pivot, said tumbler having a cam-surface'engageable with said tappet, the arrangement being such that, when the lever-cam is engaged by the wheel flange, the lever and therewith the point are rocked into one position, and, when the striker engages the tumbler, the

lever and therewith the point are rocked, into another position.

3. For cooperation with a tramway car having flanged wheels, a downwardly extending hook-shaped striker mounted on said car, and means under control of the car and a notched tumbler pivotally mounted on said rail and located in said box in the path followed by said striker when operative so that the tumbler is engaged by said striker and caused to perform a partial rotation about its pivot and concomitantly to restore said striker to inoperative position, said tumbler having a cam-surface engageable with said tappet and being loaded so as to return to initial position after each actuation, the arrangement being such that, when the lever-cam is enga ed by the wheel flange, the lever and therewith the point are rocked into one position, and, when the striker engages the tumbler, the lever and therewith the point are rocked, into another position. i

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

, WILLIAM FLEMING MOKAY.

Witnesses ISABEL M. RoLLo, DOROTHY BLACKIE. 

